EP 3844316 A1 20210707 - HIGH STRENGTH FASTENER STOCK OF WROUGHT TITANIUM ALLOY AND METHOD OF MANUFACTURING THE SAME
Title (en)
HIGH STRENGTH FASTENER STOCK OF WROUGHT TITANIUM ALLOY AND METHOD OF MANUFACTURING THE SAME
Title (de)
AUS TITANLEGIERUNG GEZOGENER, HOCHFESTER BEFESTIGUNGSMITTELSCHAFT UND VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
RÉSERVE D'ÉLÉMENTS DE FIXATION À RÉSISTANCE ÉLEVÉE EN ALLIAGE DE TITANE CORROYÉ ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
RU 2018000578 W 20180831
Abstract (en)
[origin: WO2020046161A1] This invention generally relates to the field of nonferrous metallurgy, namely to titanium alloy materials with specified mechanical properties for manufacturing the aircraft fasteners. A stock for high strength fastener is manufactured from wrought titanium alloy containing, in weight percentages, 5.5 to 6.5 Al, 3.0 to 4.5 V, 1.0 to 2.0 Mo, 0.3 to 1.5 Fe, 0.3 tol.5 Cr, 0.05 to 0.5 Zr, 0.15 to 0.3 O, 0.05 max. N, 0.08 max. C, 0.25 max. Si, balance titanium and inevitable impurities, having the value of aluminum structural equivalent [Al]eq in the range of 7.5 to 9.5, and the value of molybdenum structural equivalent [Mo]eq in the range of 6.0 to 8.5, where the equivalents are defined by the following equations: [Al]eq =[Al]+[O]x l0+ [Zr]/6; [Mo]eq =[Mo]+[V]/1.5+[Cr]xl.25+[Fe]x2.5. A manufacturing method for a stock for high strength fastener includes melting of titanium alloy ingot, production of forged billed from ingot at beta and/or alpha-beta phase field temperatures, hot rolling at a heating temperature of beta and/or alpha-beta phase field to produce a round stock, subsequent annealing of a rolled stock at a temperature of 550°C to 705°C (1022°F to 1300°F) for at least 0.5 hour followed by drawing to produce a wire with diameter up to 10 mm (0.394 inches) and subsequent annealing at a temperature of 550°C to 705°C (1022°F to 1300°F) for at least 0.5 hour. A technical result is production of a titanium alloy stock for high strength fastener having high ultimate tensile strength and double shear strength while maintaining a high level of plastic properties in the annealed condition.12 claims, 5 illustrations.
IPC 8 full level
C22F 1/18 (2006.01); C22C 14/00 (2006.01); F16B 33/00 (2006.01)
CPC (source: EP US)
C21D 8/06 (2013.01 - US); C21D 9/525 (2013.01 - US); C22C 14/00 (2013.01 - EP US); C22F 1/18 (2013.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2020046161 A1 20200305; BR 112021003069 A2 20210511; BR 112021003069 B1 20231024; CA 3110188 A1 20200305; CA 3110188 C 20230627; CN 112823218 A 20210518; EP 3844316 A1 20210707; JP 2022511276 A 20220131; JP 7223121 B2 20230215; US 11920218 B2 20240305; US 2021310104 A1 20211007
DOCDB simple family (application)
RU 2018000578 W 20180831; BR 112021003069 A 20180831; CA 3110188 A 20180831; CN 201880097056 A 20180831; EP 18792563 A 20180831; JP 2021510354 A 20180831; US 201817269142 A 20180831